Hi people!
I'm coming here after
this thread, where I'm asking about utility that can unambiguously determine the source code directory for executable in FreeBSD.
Well, as we see, there is no such utility quite yet. So I decided to make my own one.
So, here's the script that I've written (all credits go to
covacat, on top of whose script I've actually built mine. You can find his original script in the abovementioned thread):
sh:
#!/bin/sh
# src -- locate source code for executable in FreeBSD.
#
# It determines the source code depending on information
# that can be obtained from Makefiles under /usr/src.
# Operations with Makefiles require certain time, that's
# why it does it once and stores the information in the index
# file (under /usr/local/share/src by default), that is later
# issued for actual fast searching.
TOP="/usr/src"
INDEX_DIR="/usr/local/share/src"
INDEX_NAME="base.index"
INDEX="$INDEX_DIR/$INDEX_NAME"
# The program supports two forms of invocation:
# `-u [-v]': creating an index file that we will make use of when
# actually locating the sources.
# `-v' activates verbose mode - added lines will be printed.
# `[-a] file ...': find sources for specified files.
# With `-a' all the found paths are printed.
usage() {
echo "usage: src -u [-v]
src [-a] file ..."
exit 1
}
if [ "$#" = "0" ];then
usage
fi
# Check if we have a source tree.
if [ ! -d "$TOP" ];then
echo "[src]: source code directory $TOP doesn't exist." 1>&2
exit 1
fi
# The program is invoked in "update" mode, which creates an index file.
# The index file consists of lines:
# `<executable path and its hard links, if any> . <source paths>'.
# Example:
# `/bin/ed /bin/ed /bin/red . /usr/src/bin/ed'.
if [ "$1" = "-u" ];then
# If in the verbose mode, the actual lines that go to the index
# file will be directed to stdout as well.
if [ "$2" = "-v" ];then
verbose="1"
fi
# Delete previously created index file if it exists.
rm -f "$INDEX" 2>/dev/null
# Create a path for index if it doesn't exist.
mkdir -p "$INDEX_DIR" 2>/dev/null
if [ $? -ne 0 ];then
echo "[src]: can not create directory for index file $INDEX_DIR." 1>&2
exit 1
fi
# Since index file will be situated under /usr/local/share, only
# root user will be able to modify the file. We want to check if
# we have appropriate permissions for this before we start.
if ! touch "$INDEX" 2>/dev/null;then
echo "[src]: can not create an index file at $INDEX." 1>&2
exit 1
fi
# Collect all the Makefiles we possibly will be interested in.
# Also avoiding lots of Makefiles that are for tests.
for mf in $(find ${TOP}/bin/ ${TOP}/sbin/ \
${TOP}/usr.bin/ ${TOP}/usr.sbin/ \
${TOP}/libexec/ \
${TOP}/secure/usr.bin/ ${TOP}/secure/usr.sbin/ \
${TOP}/cddl/ ${TOP}/kerberos5/ \
-type f \
-name Makefile \
-not -path "*\/*tests\/*" \
-maxdepth 4)
do
mfd=$(dirname $mf)
# Now we want to filter the Makefiles we don't need.
# We're only looking for those ones that are for producing
# binaries (PROG or PROG_CXX) or scripts (man(1), for example,
# is actually a shell script, but we want to be able to search
# for its source too).
if grep -Eq "(PROG(_CXX)|SCRIPTS)?\??( | )*=" $mf ;then
# Here we're obtaining paths that this Makefile searches through.
# It's stored in `.PATH' variable.
sea_paths=$(make -C "$mfd" \
-V '${.PATH}' \
-f $mf \
2>/dev/null \
|sed "s/\.//")
# If no such paths, then just skip this Makefile.
if [ "$sea_paths" = " ." ];then
continue
fi
seas=" ."
# Now we try to filter out all the search paths
# that do not actually contain the source code.
# If the path does not have source code files for
# C, C++ programs or shell scripts, or there are
# no executable files (that usually go without extensions),
# then it's most likely not a source code directory.
for sea in $sea_paths;do
prog_files=$(find "$sea" -type f \
\( -perm -111 \
-or -name "*\.c" \
-or -name "*\.cpp" \
-or -name "*\.cc" \
-or -name "*\.sh" \
-or -name "*\.y" \) \
-maxdepth 1)
if [ -n "$prog_files" ];then
seas="$seas $sea"
fi
done
# Obtain binary destination path and its hard links.
bin_and_links=$(make -C "$mfd" \
-V '${BINDIR}/${PROGNAME} ${LINKS}' \
-f $mf \
2>/dev/null
)
# We have included scripts in our search along with binaries,
# but a lot of Makefiles produce scripts that are used for
# building, I guess, and they are not system-wide.
# We can tell it's one of such scripts if its search
# paths look like that:
if [ "$bin_and_links" = "/ " ] \
|| [ "$bin_and_links" = "/bin/ " ] \
|| [ "$bin_and_links" = "/sbin/ " ] \
|| [ "$bin_and_links" = "/usr/bin/ " ] \
|| [ "$bin_and_links" = "/usr/sbin/ " ];then
continue
fi
# Build up an index line entry.
index_line=$(echo "$bin_and_links$seas" |sed 's/ / /g')
if [ "$verbose" = "1" ];
then echo "$index_line" |tee -a "$INDEX"
else echo "$index_line" >>"$INDEX"
fi
fi
done
exit 0
fi
# If we've reached this place, this means we're in the
# second invocation form (searching sources).
# First, check if we have an index file.
if [ ! -f "$INDEX" ];then
echo "[src]: index file $INDEX not found." 1>&2
exit 1
fi
# In "print all" mode all the paths, that were found
# (usually more than one path is found, when the program is
# built of several modules or it also can be that the program
# includes a source code of some external program).
if [ "$1" = "-a" ];then
all_mode="1"
shift
if [ "$#" = "0" ];then
usage
fi
fi
# Search paths for specified programs one-by-one.
tgts="$@"
for tgt in $tgts;do
tgt_path=$(which $tgt 2>/dev/null)
if [ "$?" != "0" ];then
echo "[src]: $tgt is not found." 1>&2
continue
fi
# Resolve symlinks (like tar(1) is a symlink to /usr/bin/bsdtar).
# And also escape characters like "[" and "." for executables
# like [(1) (which is also test(1)) (otherwise, they will be
# treated as part of regex sytax by grep(1)).
tgt_path=$(realpath "$tgt_path" \
|sed -e 's/\[/\\\[/g' \
-e 's/\./\\\./g')
# Search the target path in the index file.
# Looking only into the first part of line, where binaries and links.
srcs=$(grep "$tgt_path .*\. " "$INDEX")
if [ -z "$srcs" ];then
echo "[src]: no sources found for $tgt." 1>&2
continue
fi
srcs=$(echo "$srcs" |sed 's/.* \. //')
# Print only first path or all of them if appropriate flag is set.
for src in $srcs;do
echo "$src"
if [ "$all_mode" != "1" ];then
break
fi
done
done
First it needs to create an index file (according to
hier(7) I decided that
/usr/local/share would be the right place) with (as root):
src -u (also you can provide
-v flag to see the lines written to the file). It's needed because walking through
/usr/src and issuing lots of
Makefiles takes long time. As a result, index file takes 59K on my machine.
And when it's done you can find sources with
src <program path or name> ... (you can also provide
-a flag to print all the paths were found).
I tried to make it cover all the (edge)cases, because it appeared that there are some tricky ones. Let me show you some examples:
1)
src sha1 ->
/usr/src/sbin/md5.
/sbin/sha1 is a hardlink to
/sbin/md5.
2)
src strip ->
/usr/src/contrib/elftoolchain/elfcopy.
Also hard link case, but source directory is not that obvious.
3)
src tar ->
/usr/src/contrib/libarchive/tar.
/usr/bin/tar is a symlink to
/usr/bin/bsdtar.
4)
src man ->
/usr/src/usr.bin/man.
I didn't know, but
/usr/bin/man is a shell script. It also works.
However, there are few cases that don't work or perhaps work not exactly the way we want them to:
1)
src make ->
/usr/src/contrib/bmake/filemon
The scripts looks into
.PATH make(1) variable to find the source path. But some sources include external (or additional) modules *before* the main module. As you can see, this is one of these cases. But, well, from the path it returned it's still possible to figure that actual source directory is one level up.
2)
src wpa_cli -> can't find sources.
I sorta found what's the problem. There is a line from
/usr/src/usr.sbin/wpa/wpa_cli/Makefile:
Makefile:
.PATH.c:${WPA_SUPPLICANT_DISTDIR}
Yeah, it uses
.PATH.c instead of
.PATH. But when I try to execute
make -V '${.PATH.c}' on this file, it doesn't give anything (but it works with
.PATH, which doesn't include the path we need). Here I want to ask you: maybe you know why this happens / any ideas on how to handle this case?
Well, it seems to be all. You can also look into source code itself - I tried to leave explanatory comments.
Thank you,
Artem
An empty string implicilty denotes the current working directory; concededly, this notation is a legacy feature.